Details of case against Dzhokhar Tsarnaev

The Justice Department charged 19-year-old Dzhokhar Tsarnaev with bombing the Boston Marathon on Monday, officially accusing the Chechen immigrant of setting off one of the explosives in the terrorist attack that killed three people and wounded more than 200.

Tsarnaev was arraigned in his hospital room at Beth Israel Deaconess Medical Center. The formal charges are one count of using and conspiring to use a weapon of mass destruction and one count of malicious destruction of property by means of an explosive device resulting in death. If convicted, Tsarnaev could face an unlimited prison term or the death penalty.

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The complaint does not mention the murder of MIT police officer Sean Collier and Tsarnaev has not yet been charged in his death.

Here’s an outline of the Justice Department’s case against Tsarnaev.

At 2:45 p.m. on April 15, video taken from a surveillance camera at The Forum restaurant, near the marathon’s finish line on Boylston Street and the site of the second explosion, shows a man believed to be Tsarnaev slipping his backpack off his back and onto the ground. The man stays near his bag for the next four minutes, looking at his phone and apparently taking a picture, according to the complaint.

A photograph taken from across the street shows the bag laying at the man’s feet.

Thirty seconds before the first explosion, the suspect brings his phone to his ear and keeps it there for 18 seconds. As the first bomb goes off, the crowd reacts and begins streaming away from the marathon’s finish line. “Bomber Two, virtually alone among the individuals in front of the restaurant, appears calm,” FBI agent Daniel Genck writes in the complaint.

The suspect walks away from the finish line, leaving his bag behind. Ten seconds later, the second explosion occurs. “I can discern nothing in that location in the period before the explosion might have caused that explosion, other than Bomber Two’s knapsack,” Genck writes.

Shortly before midnight on Friday, a man is carjacked in Cambridge. The perpetrator — the complaint never conclusively accuses either Dzhokhar or his now-dead brother, Tamelan — points and gun at the victim. “Did you hear about the Boston explosion?” the suspect asks. “I did that.” The man removes a bullet from the gun’s magazine, puts it back in and declares: “I am serious.”

The victim and the suspect drive and pick up a second man. The suspect and the second man talk in a foreign language. The gun-wielding suspect demands money from the victim, who gives him $45. The two carjackers demand the man drive to an ATM, where they take money from the victim’s account. The victim escapes when the two carjackers stop at a convenience store.

The FBI reviewed footage from the convenience store’s surveillance camera and agents identified the two suspects at Dzhokhar and Tamerlan Tsarnaev.

Police encounter the stolen vehicle in suburban Watertown. Police and the carjackers exchange gunfire, and the carjackers throw several explosives at police. The FBI later recovers two unexploded improvised explosive devices from the street, along with the remains of multiple exploded IEDs. One of the suspects is injured and remains at the scene while the other flees in the stolen car.

The IEDs recovered at the scene in Watertown and the IEDs set off at the Marathon have the same design, used the same brand of pressure cooker and both contained BBs “contained in an adhesive material.” Both also used a green-colored hobby fuse.

Police searched Dzhokhar Tsarnaev’s dorm room at the University of Massachusetts-Dartmouth on Sunday. They find a “large pyrotechnic,” BBs and a white hat and black jacket matching those worn by the second bomber.